P387 “THE IMPORTANCE OF NEW ADVANCED IMAGING TECHNIQUES IN SINE CAUSA VENTRICULAR ARRHYTHMIAS”

Abstract Case Presentation A 61–years–old woman was referred to our center after her 33 years old daughter suffered a sudden cardiac death. Cardiovascular risk factors: dyslipidemia and family history of ischemic cardiomyopathy. Diagnostic and Therapeutic Work Up Patient’s ECG was normal. Holter ECG showed frequent ventricular extrasystoles (2000/die) isolated and not premature, with LBB morphology, associated with not sustained ventricular tachycardias with LLB and low axis morphology (HR mean 140–170 beats/min). Exercise Stress Test did not show a clear correlation between physical activity and arrhythmias. Beta blocker therapy was started and was only partially effective in reducing ventricular arrhythmias, and a loop recorder was implanted. In 2019 a cardiac MRI with adenosine was performed, showing a mild globular shaped left ventricle with a non–specific linear distribution of LGE in the middle septum. Genetic analysis for channelopathies and cardiomyopathies resulted negative. In the last advanced echocardiogram (2022) with 3D reconstruction and strain analyses, characteristics suspected for arrhythmic mitral valve prolapse (MAD and curling of inferolateral wall) were identified. Accordingly, it has been decided to perform a second cardiac MRI to better characterize the underlying cardiac condition and to define the appropriate risk stratification algorithm. Conclusions Arrhythmic mitral valve prolapse is defined by ventricular arrhythmias in the absence of other known causes and it is present in up to 13% of sudden cardiac deaths in female patients. According to the recent consensus document by EHRA, sudden cardiac death risk stratification is complex and based firstly on the evaluation of arrhythmic burden, and secondly on symptoms and additional risk factors (i.e. MAD, left ventricle disfunction, flap redundancy, LGE in specific areas and so on). This case shows the importance of advanced imaging techniques and multimodal approach in ventricular arrhythmias evaluation.